LeAnn Rimes & Husband Divorcing

"After much thoughtful mutual consideration, Deane and I have agreed to move forward with dissolving our marriage," the country star says on her Web site using the spelling of her husband's given name. "This decision was amicable and we remain committed and caring friends with great admiration for one another. Thank you so much for all of your continued love and support – it is deeply appreciated."

Rimes, who turned 27 on Friday, married Sheremet in 2002 when she was 19 and he was 21. They separated amid allegations of an affair with actor Eddie Cibrian after the two met while filming the Lifetime movie Northern Lights last fall. Cibrian, meanwhile, filed for divorce from wife Brandi Glanville last week.

Rimes's longtime friend, Dope Den Productions founder Jeff Berger, says that Rimes and Sheremet, a songwriter and former dancer, are "doing their best to handle it as mature adults."

"Dean's her best friend and that's the crux of the issue; when you love and care about somebody who's your best friend – how not to cause them pain," he says. "Le and Dean are both great people and, unfortunately, going through a tough situation. But they're doing what needs to be done in as amicable a way as possible."

Sheremet, a former professional dancer, is attending culinary school in New York. He posted a message on his Twitter page Tuesday: "Back to school kids, first time in 10 years."